Dave: I replaced mine and yes the magnets are plenty strong. there is also a bayonet mount you turn and it locks. I would replace mine in a heart beat again. One nice feature with it off you can use the flash with no shadow.

I didn't have the first version, but I did buy the second. In addition to the magnetic attraction, there's a bayonet-style catch. It's pretty damn well thought out. No way it's coming off unless you intend, and then it goes off easily. The tiny adapter that's stuck to the lens (when the filter is removed) is hardly noticeable. These guys did their homework.

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